.banner {
  height: 440px;
  position: relative;
}


.imgapp {
  height: 390px;
  background-color: aqua;
}
.imgapp img {
  height: 390px;
}


/* 侧导航 */
.subnav {
    position: absolute;
    width: 250px;
    height: 440px;
    background-color: rgba(0,0,0,0.42);
  }
  
  .subnav li {
    padding-left: 30px;
    padding-right: 12px;
    height: 62px;
    line-height: 62px;
    color:white;
    font-weight:500;
    cursor: pointer;
    /* background-color: rgb(25, 27, 27); */
  }
  
  /* a所有都是小字，分类是大字 */
  .subnav li a {
    margin-right: 5px;
    font-size: 18px;
    color: #fff;
  }
   /* .subnav li .classify {
    margin-right: 14px;
    font-size: 16px;
  } 
    */
 
  
  